Materials Research Express
·
2020
·Vol. 7
·期 3
·035026
·
IF 1.929
Qianxi Fang,Weiqiu Huang,Hongning Wang
SiO2 aerogels were prepared by sol-gel method and methyl alkylation reaction using TEOS as silicon sources. Silica-supported polyethylenimine (PEI/SiO2) adsorbents for CO2 adsorption were prepare by grafting techniques, in which mesoporous SiO2 aerogel was loaded with PEI and organic compounds functionalized by hydroxyl or amino groups as dopants. CO2 adsorption isotherms of PEI amine-modified SiO2 aerogels were measured and the results show that the maximum CO2 adsorption capacity (1.8 mmol g−1) was obtained over a doped SA-PEI-N-Y loaded with 45% PEI and 15% N-Y (N-[3-(Trimethoxysilyl)propyl]ethylenediamine, denoted as N-Y). In addition, SA-PEI-N-Y has stronger thermal stability than SA-PEI-60% in nitrogen from room temperature to 800 °C at a heating rate of 10 °C min−1. It turns out that N-[3-(Trimethoxysilyl)propyl]ethylenediamine is the best dopant.
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高影响因子
Catalysts
·
2022
·Vol. 12
·期 4
·427
·
IF 4.501
Chen Qi,Somboon Chaemchuen,Meng Liu,Jichao Wang,Serge Zhuiykov,Francis Verpoort
Nitrogen-doped porous carbon material was generated via thermal pyrolysis of zeolitic imidazole frameworks (ZIFs). The structure of the ZIF templates was tuned, so that the obtained product was an N-doped porous carbon-containing encapsulated metal nanoparticle. The hierarchical structural and unique properties of pyrolyzed materials are involved in further application, including catalysis. The as-synthesized porous carbon materials were applied as a catalyst for CO2fixation on cyclic carbonates under near ambient pressure without solvent and co-catalyst. The zinc dispersion in highly porous carbon material, deriving from ZIF-8, exhibited a superior catalytic performance among the synthesized materials. The acid sites (Zn species) and the incorporated basic sites (N-species) present in the porous carbon material are essential for a high affinity for gas adsorption and CO2conversion. Additionally, the catalyst was found to be very robust and stable during recycling studies as the catalytic performance remained high for seven cycles.
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高影响因子
RSC Advances
·
2022
·Vol. 12
·期 14
·8592-8599
·
IF 4.036
Yan Zhang,Ziqi Wei,Xing Liu,Fan Liu,Zhihong Yan,Shangyong Zhou,Jun Wang,Shuguang Deng
Biomass-derived porous carbons are regarded as the most preferential adsorbents for CO2 capture due to their well-developed textural properties, tunable porosity and low cost. Herein, novel porous carbons were facilely prepared by activation of palm sheath for the highly selective separation of CO2 from gas mixtures. The textural features of carbon materials were characterized by the analysis of surface morphology and N2 isotherms for textural characterization. The as-prepared carbon adsorbents possess an excellent CO2 adsorption capacity of 3.48 mmol g−1 (298 K) and 5.28 mmol g−1 (273 K) at 1 bar, and outstanding IAST selectivities of CO2/N2, CO2/CH4, and CH4/N2 up to 32.7, 7.1 and 4.6 at 298 K and 1 bar, respectively. Also, the adsorption evaluation criteria of the vacuum swing adsorption (VSA) process, the breakthrough experiments, and the cyclic experiments have comprehensively demonstrated the palm sheath derived porous carbons as efficient adsorbents for practical applications.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Juzheng Song,Jie Liu,Wei Zhao,Yan Chen,Hang Xiao,Xiaoyang Shi,Yilun Liu,Xi Chen
Developing inexpensive and highly efficient CO2 air capture technologies is an important solution for solving the greenhouse problem. In this work, we used the low-cost quaternized chitosan (QCS)/poly(vinyl alcohol) (PVA) hybrid aerogels with quaternary ammonium groups and hydroxide ions to reversibly capture CO2 from ambient air by humidity swing. The CO2 capture capacity and adsorption rate of the aerogels were investigated over the temperature range 10–30 °C. The CO2 capture capacity of the aerogels was measured to be about 0.18 mmol/g, which is 38% higher than the state-of-the-art commercial membrane. In addition, we proposed a modified pseudo-first-order kinetic model considering both the CO2 adsorption and the H2O desorption, which describes the experimental results very well. For the first time, the moisture-swing CO2 adsorbent is built by low-cost biomass material, which opens up a new approach for the design of the moisture-swing CO2 adsorbent.
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高影响因子
Green Chemical Engineering
·
2020
·
IF 0
Weifang Zhu,Fu Liu,Minmin Gou,Ruili Guo,Xueqin Li
The two-dimensional (2D) nanosheet zinc cobaltate (ZnCo 2 O 4 ) was added into polyether block amide (Pebax) matrix to prepare mixing matrix membrane (MMM) for separating carbon dioxide (CO 2 )/methane (CH 4 ) gas mixture. The 2D porous ZnCo 2 O 4 nanosheets were composed of chemically interconnected metal oxide nanoparticles. The ZnCo 2 O 4 nanoparticles in the nanosheets constructed large-quantity pores of 11.78 nm and provided abundant transfer channels for gas molecule. Moreover, the synergistic effect of bimetallic Zn 2+ and Co 2+ would promote the generation of oxygen vacancies (O δ− ), which could provide more CO 2 (C δ+ ) adsorption sites, thereby increased the selectivity of the membrane. The large aspect ratio of the ultra-thin ZnCo 2 O 4 nanosheets showed better dispersion in the membrane. The pure gas separation performance data showed the CO 2 permeability and CO 2 /CH 4 selectivity of Pebax/ZnCo 2 O 4 membrane were 139.10 Barrer and 15.38, respectively, when the filling amount was 0.5 wt%. Compared with pure Pebax membrane, the separation performance (permeability and selectivity) were increased with 165.67% and 75.57%, respectively.
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DOI
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Hanqing Lin,Ke Gong,Petr Hykys,Danke Chen,Wen Ying,Zdenek Sofer,Youguo Yan,Zhen Li,Xinsheng Peng
CO 2 separation and recovery technology is a significant part of resolving the global greenhouse issue. In order to develop a cost-effective and high-performance method to realize CO 2 separation, a new kind of supported liquid membrane was configured by incorporating deep eutectic solvent into the nanoslits of titanium carbide (Ti 3 C 2 T x ) membrane. The deep eutectic solvent is a novel ionic liquid analogous with equal physical and chemical advantages but more economical and environmental benign. And the Ti 3 C 2 T x , as a neoteric two-dimension material, can serve as a valid platform for supporting the deep eutectic absorbent. By combining the two kinds of material, the resultant Ti 3 C 2 T x supported deep eutectic liquid membrane shows good CO 2 preference against other light gases as well as high thermal stability and long-term durability. The permeance of CO 2 is about 26.35 GPU with selectivity over N 2 , CH 4 and H 2 are 319.15, 249.01 and 12.38, respectively. The molecule dynamic simulation is also applied to uncover the separation mechanism of CO 2 and the ingredient redistribution and interionic refactor phenomenon of deep eutectic solvent trapped in the Ti 3 C 2 T x nanoslits.
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高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2021
·
IF 3.247
Wenwen Huang,Jiacheng Liu,Na Rao,Guozhi Fan,Juntao Yan,Qunpeng Cheng,Guangsen Song
Concerning the increasing greenhouse effect, the development of efficient CO2 adsorbents is very important. In this study, the influence of surfactant on the adsorption performance of amine-functionalized MCM-41 was analysed. The results showed that the residual amount of surfactant in MCM-41 was gradually decreased with the increase of calcination temperature which improved the pore structure. The maximum adsorption capacity (5.495 mmol/g) appeared at PEI-MCM-41-100°C indicated that the adsorption capacity could be improved under the function of surfactant. By calculating the diffusion coefficient of CO2 adsorption process in PEI-MCM-41-100/200/300/400/550°C, the diffusion resistance of CO2 was the lowest in PEI-MCM-41-100°C, which directly proved that the synergism of surfactant and organic amine could reduce the diffusion resistance of CO2 in the pore.
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高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2024
·
IF 3.3
Tianyu Zhu,Yue Xu,Zhenjiang Li,Jun He,Xin Yuan,Dong Qian,Tong Chang,Longlin Lu,Bo Chi,Kai Guo
A halide-free ionic pair organocatalyst was proposed for the cycloaddition of CO2 into epoxide reactions. Cholinium pyridinolate ionic pairs with three different substitution positions were designed. Under conditions of temperature of 120 °C, pressure of 1 MPa CO2, and catalyst loading of 5 mol %, the optimal catalyst cholinium 4-pyridinolate ([Ch]+[4-OP]−) was employed. After a reaction time of 12 h, styrene oxide was successfully converted into the corresponding cyclic carbonate, and its selectivity was improved to 90%. A series of terminal epoxides were converted into cyclic carbonates within 12 h, with yields ranging from 80 to 99%. The proposed mechanism was verified by 1H NMR and 13C NMR titrations. Cholinium cations act as a hydrogen bond donor to activate epoxides, and pyridinolate anions combine with carbon dioxide to form intermediate carbonate anions that attack epoxides as nucleophiles and lead to ring opening. In summary, a halide-free ionic pair organocatalyst was designed and the catalytic mechanism in the cycloaddition of CO2 into epoxides reactions was proposed.
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Zeyou Meng,Yuhao Hu,Xin Ye,Xiao Sun,Jun Hu,Zhen Wang,Jiabao Qiang,Sanping Chen,Gang Xie
To address the limitation of mono-pore mode SBA-15 on adsorption efficiency and the aggregation of amine groups within the confined pores, an innovative TEOS hydrolysis-driven dual-pore strategy to fabricate SBA-15-Dual-Mesopore (SBA-DMP) structure with covalent-grafted of 3-trimethoxysilylpropan-1-amine (APTMS) is proposed. Structural and thermodynamic characterizations reveal that this dual-mesopore design provides more CO 2 adsorption sites, and the larger mesopores exhibit a strong affinity for tetraethylenepentamine (TEPA) that significantly enhances its dispersion and incorporation efficiency. Of noted, for the first time, electron paramagnetic resonance (EPR) spectroscopy is employed to study the electronic interactions within amine-functionalized materials, indicating that APTMS-induced surface hydrogen bonds facilitate lone pair electron delocalization through electronic rearrangement, improving the local electronic density around secondary amines. Microcalorimetric studies, along with temperature-programmed desorption (TPD) and density functional theory (DFT) calculations, confirm that hydrogen bonding significantly enhances the reactivity of secondary amines, leading to a high CO 2 adsorption capacity of 5.83 mmol g −1 at 70 °C under 10 % CO 2 (60 % RH). The comprehensive evaluation of the SBA-DMP material demonstrates an excellent amine efficiency, adsorption stability, recyclability, and selectivity, highlighting its suitability for practical CO 2 capture. The dual-mesopore design with surface hydrogen bonding collectively advances CO 2 adsorption efficiency, offering a practical and effective solution for carbon capture.
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产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2020
·
IF 7.216
Jin-Feng Liao,Ya-Ting Cai,Jun-Yan Li,Yong Jiang,Xu-Dong Wang,Hong-Yan Chen,Dai-Bin Kuang
The optoelectronic performance of CsPbBr 3 nanocrystal (NC) has been dramatically limited by the severe charge carrier recombination and its narrow light absorption range, which are anticipated to be resolved via coupling with plasmonic Au nanoparticle (NP). In view of this, CsPbBr 3 –Au nanocomposite is fabricated and further employed as a concept model to study the electronic interaction between perovskite NC and Au NP for the first time. It has been found that the excitation-wavelength dependent carrier transfer behavior exists in CsPbBr 3 –Au nanocomposite. Upon illumination with visible light ( λ >420 nm), photo-generated electrons in CsPbBr 3 can inject into Au with an electron injection rate and efficiency of 2.84 × 10 9 s −1 and 78%, respectively. The boosted charge separation is further translated into a 3.2-fold enhancement in CO 2 photocatalytic reduction activity compared with pristine CsPbBr 3 . On the other hand, when solely exciting Au NP with longer wavelength light ( λ >580 nm), the localized surface plasmon resonance (LSPR) induced hot electrons in Au NPs can transfer to CsPbBr 3 NC and further participate in photocatalytic reaction towards CO 2 reduction. The present study provides new insights into preparing plasmonic nanostructure to enhance the performance of perovskite based optoelectronic devices.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 16
·11595-11606
·
IF 2.993
Wu Keliang,Dong Xuejun,Zhu Junfang,Wu Pengcheng,Liu Chang,Wang Yixi,Wu Jianning,Hou Juan,Liu Zhiyong,Guo Xuhong
The nanostructured heterojunction photocatalysts are considered promising in photocatalytic reduction in the carbon dioxide. Herein, we demonstrate a simple sol–gel and hydrolysis process to design nanostructured TiO 2 /ZnO heterojunction, by using the biological template celery stalk. The nanostructured photocatalyst consists of anatase TiO 2 and wurtzite ZnO nanoparticles. A well-connected heterojunction, with uniformly distributed nanoparticles, on the pores and folds of celery stems, is obtained. The enhanced specific surface area of 55.5 m 2 /g is achieved. The crystal structure, morphology and surface composition are investigated by electron microscopy, X-ray photoelectron spectroscopy and X-ray diffraction. Furthermore, we demonstrate the photocatalytic performance of as-synthesized nanostructure TiO 2 /ZnO heterojunction. The photocatalytic yield, of CO 2 reduction into CH 4 , exhibits a five times increase, from 0.55 to 2.56 µmol h −1 g −1 , for the nanocomposite as compared to the pure TiO 2 . This enhanced performance corresponds to the efficient charge transfer and hindrance in the recombination of electron–hole pairs due to the optimum band positions of ZnO and TiO 2 . This study demonstrates the potential of using biotemplates to design efficient photocatalysts to convert CO 2 into useful solar fuels.
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高影响因子
Frontiers of Chemical Science and Engineering
·
2020
·Vol. 15
·期 4
·882-891
·
IF 3.552
Fan Yiyi,Li Jinyong,Wang Saidi,Meng Xiuxia,Jin Yun,Yang Naitao,Meng Bo,Li Jiaquan,Liu Shaomin
Hydrogen fuel has been embraced as a potential long-term solution to the growing demand for clean energy. A membrane-assisted separation is promising in producing high-purity H 2 . Molecular sieving membranes (MSMs) are endowed with high gas selectivity and permeability because their well-defined micropores can facilitate molecular exclusion, diffusion, and adsorption. In this work, MXene nanosheets intercalated with Ni 2+ were assembled to form an MSM supported on Al 2 O 3 hollow fiber via a vacuum-assisted filtration and drying process. The prepared membranes showed excellent H 2 /CO 2 mixture separation performance at room temperature. Separation factor reached 615 with a hydrogen permeance of 8.35 × 10 −8 mol·m −2 ·s −1 ·Pa −1 . Compared with the original Ti 3 C 2 T x /Al 2 O 3 hollow fiber membranes, the permeation of hydrogen through the Ni 2+ -Ti 3 C 2 T x /Al 2 O 3 membrane was considerably increased, stemming from the strong interaction between the negatively charged MXene nanosheets and Ni 2+ . The interlayer spacing of MSMs was tuned by Ni 2+ . During 200-hour testing, the resultant membrane maintained an excellent gas separation without any substantial performance decline. Our results indicate that the Ni 2+ tailored Ti 3 C 2 T x /Al 2 O 3 hollow fiber membranes can inspire promising industrial applications.
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高影响因子
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